@Ernest has pushed an update which allows users to request ownership/moderation of abandoned magazines. Ghost/abandoned magazines were fairly prevalent after the initial wave of hype due to users either squatting magazine names or becoming inactive for other reasons. Now is your chance to get involved, if you were waiting to do so.
To request ownership/moderator privileges, scroll down to where it says “MODERATORS” in the sidebar. There will be an icon of a hand pointing upwards that you can click on, then make the request. Cheers, and thank you for your hard work Ernest, as well as future mods.
It may be worthwhile auto-deleting any with zero historical activity (no threads or microblogs) after a few months, too.
As a stop gap and when I have a few spare hours. I plan to request ownership for mags that have zero activity, and the current mod has been MIA for a few months.